the Genera Tursiops, Orca, and Lagcnorhynchus. 185 



muzzle is shorter than the cranium 

 properly so called, and its width at 

 the base is about two thirds of its 

 length. The upper part of the 

 intermaxillaries in front of the 

 nostrils (the " triangle ") is inflated, 

 and the part of the maxillaries 

 which accompanies it is hollowed 

 out into a groove. The teeth are 

 about 26 in number in the half of 

 each jaw, and there are never more 

 than 30 ; they measure as much as 

 19 millim. in length and 7 millim. 

 in diameter at the base ; there are 

 about 4 of them to one inch. 



Vertebraj : 88-92=7+15-16+ 

 23-24+43-45. The last neura- 

 pophysis and the last parapophysis 

 occur respectively upon one of the 

 76-79th and 69-72nd vertebrae, and 

 the first perforant vascular canal 

 upon one of the 67-69th vertebras. 

 The first two cervical vertebrae 

 alone are soldered together by their 

 bodies ; in old individuals their 

 comparatively short and broad 

 spinous apophysis is also soldered 

 to the two following ; their trans- 

 verse apophysis is rounded and 

 massive, and the superior transverse 

 apophysis of the seventh cervical 

 vertebra is not shorter than that 

 of the first thoracic vertebra. The 

 prosternum is flat, with a deep notch 

 starting from the anterior margin 

 (it may also be perforated). The 

 first 6 or 7 pairs of ribs are fur- 

 nished with a head and a neck. 

 The scapula is comparatively broad ; 

 its height is to its breadth as 2 : 3. 

 The whole skeleton is exceedingly 

 robust in old individuals, the inter- 

 vals between the neurapophyses 

 are insignificant, and strictly speak- 

 ing there is no part of the vertebral 

 column in which the metapophyses 

 are completely wanting. The 

 longest neurapophyses correspond 

 with 62 vertebrae, the longest para- 

 pophyses with 5, and the neura- 

 pophyses of the caudal vertebrae 

 are more vertical. 



The broad anterior limbs in adult 

 individuals are not quite one sixth 

 a.9 long as the whole length of the 

 skeleton. The number of joints in 

 the digits is ], 9 (10), 7, 4, 3 ; the 



is in general longer than the cra- 

 nium properly so called, and its 

 width at the base is equal to about 

 half its length. The upper part of 

 the intermaxillaries (the " tri- 

 angle ") is flat and slightly hol- 

 lowed, and the contiguous parts of 

 the maxillaries are not hollowed 

 out. The teeth are about 35 in 

 number, and not more than 40 ; 

 they are about 10 millim. long and 

 about 3 millim. in diameter at the 

 base ; there are about 5 of them to 

 one inch. 



Vertebrfe : 78-82=7+14-15+ 

 18-22-1-38-41. The last neura- 

 pophysis and the last parapophysis 

 are respectively upon one of the 

 67-70th and 63-65th vertebrfe, and 

 the first vascular canal upon one of 

 the 55-61st vertebrae. The first 

 four cervical vertebrae, in adult in- 

 dividuals, are soldered together 

 both by the bodies and the arches, 

 their spinous apophysis is high and 

 delicate ; the transverse apophysis 

 of the first two is flat, and the 

 transverse apophysis of the seventh 

 is not much developed. The pro- 

 sternum is perforated, but without 

 a notch, very convex or as if bro- 

 ken, and its anterior part is hollowed 

 out crosswise. The first 5-6 (7) 

 pairs of ribs are fm'nished with a 

 head and a neck. The scapula is 

 not so wide, its height being to its 

 width as 2-2-5. The skeleton is of 

 a less robust character, the inter- 

 vals between the apophyses of the 

 vertebras are greater, there are 11- 

 16 vertebne without distinct meta- 

 pophyses, the longest neurapophyses 

 correspond to 4^ vertebrae and the 

 longest parapophyses to 3|. The 

 neurapophyses of the caudal ver- 

 tebrae are directed more obHquely 

 forward. 



The length of the naiTow and 

 pointed anterior limbs is scarcely 

 one seventh of that of the whole 

 skeleton. The number of joints in 

 the digits is 2 (3), 10 (9), 6 (7), 



